/**
 * Class {@link CipherUtil} encapsulates utility methods for encrypting and decrypting data.
 * The encryption algorithm used is AES in CBC mode.
 *
 * @example
 * const encrypted = CipherUtil.aesEncrypt("Hello World!", KEY, IV);
 * const decrypted = CipherUtil.aesDecrypt(encrypted, KEY, IV);
 * // decrypted is "Hello World!"
 */
export default abstract class CipherUtil {
    /**
     * XORs two buffers together, returning a new buffer of the same length.
     * @param buf1 The first buffer to XOR.
     * @param buf2 The second buffer to XOR.
     * @returns A new buffer containing the result of the XOR operation.
     */
    private static xorBuffers;
    /**
     * Adds padding to a buffer to make its length a multiple of the block size.
     * This is necessary for certain encryption algorithms that require the input
     * to be a multiple of the block size.
     * @param buffer The buffer to add padding to.
     * @param blockSize The block size to pad to.
     * @returns A new buffer that is padded to the specified block size.
     */
    private static addPadding;
    /**
     * Removes the PKCS#7 padding from an encrypted buffer.
     * @param buffer The encrypted buffer to remove padding from.
     * @returns The decrypted plaintext buffer.
     */
    private static removePadding;
    /**
     * Encrypts a plaintext using AES in CBC mode.
     * @param plainText The plaintext to encrypt.
     * @param key The key to use for encryption.
     * @param iv The initialization vector to use for encryption.
     * @returns The encrypted ciphertext.
     */
    private static aesEncrypt;
    /**
     * Decrypts a given buffer using AES in CBC mode.
     * @param encrypted The buffer to decrypt.
     * @param key The key to use for decryption.
     * @param iv The initialization vector to use for decryption.
     * @returns The decrypted buffer.
     */
    private static aesDecrypt;
    /**
     * Encrypts the given text using AES encryption.
     *
     * @param text - The text to encrypt.
     * @returns The encrypted text as a hexadecimal string.
     */
    static encrypt(text: string): string;
    /**
     * Decrypts the given text using AES in CBC mode.
     * @param {string} text The text to decrypt.
     * @returns {string} The decrypted text.
     */
    static decrypt(text: string): string;
}